Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebe48a3af3c33c8…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 09:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aa96a3a36766b2b09e8a3005a08b5c5d SHA-1: e457afccd2513d55f08639bb9944133e416c8a16 SHA-256: eebe48a3af3c33c88e19659dc12f3478d043f1f98c4f14f4a260caa11a0a48c8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing a browser extension or update. Numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a distribution network for malicious content. No scripts were extracted, but the overall pattern suggests a social engineering attack to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=open+json+file+on+android PDF link annotation
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/wigowelavirikubulejilusa.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/pajoturofoxetajifoxome.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/25627994074.pdfIn PDF document text
    • http://orthopediedelft.eu/files/pixufemazepetowutitud.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/vurozugo.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/lepajodobazurakozatafeso.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/48048811926.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/vesakurupeson.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/84921089082.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/pifemagudejadikofeg.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/fdb0e3bffa0b6154ff80d21fb23d199f/72216977463.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/88187544575.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144234d7a2dd---30862250816.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/kfnoitkd6krtvj48flk2o4rmk6/77124395998.pdfIn PDF document text
    • http://canadanur.com/resimler/files/58247012225.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/punamigovuxabutebizisevi.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/42443175126.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/23515870640.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/tewumozinisut.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/36010643278.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/67540718182.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210915195224.pdfIn PDF document text
    • http://juentai.com/userfiles/files/jutajaribowov.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/23353792974.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 17660 bytes
SHA-256: c2b21fd999aa3438d4cf2434a7aaa3490a2484a4d1275e184dea40d81e0a4349
font_02_sfnt_off00012677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12677 10548 bytes
SHA-256: bf8f8e7da92dcd2de2c5516c0a49ab795654d6333669b597e5796522d6269da8

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